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EV charging cost calculator

Work out what charging your electric car really costs – for a distance, a month or a year, split into home charging, public charging and your own solar power.

Annual or monthly mileage

The distance you drive with the car.

The energy the car takes from the battery – the figure from the trip computer, not the WLTP rating. The WLTP figure already includes charging losses and therefore does not fit this field.

Energy is lost while charging. An 11 kW wallbox loses about 5 to 7 %, a household socket 13 to 24 %, rapid charging 5 to 15 %.

Where do you charge?

Both shares must add up to exactly 100 %.

Your unit price from your electricity bill.

The price of your charging tariff or the ad-hoc price at the charge point.

Include your own solar power for home charging

How much of your home charging comes from your own system.

Solar power is not free: you could feed it in instead. A common approach is the feed-in tariff you give up.

Compare a second charging scenario

The second scenario is calculated without solar power so that both figures stay comparable.

Everything you enter stays in your browser.

How the calculator works

  • Consumption (kWh) = mileage (km) × consumption (kWh/100 km) ÷ 100. Grid energy (kWh) = consumption ÷ (1 − charging loss rate).
  • The home and public shares refer to grid energy including charging losses and must add up to 100 %.
  • The consumption figure must be the energy the car takes from the battery. The WLTP figure already includes charging losses and is therefore higher.
  • Charging losses are not added on but divided out: grid energy = battery energy ÷ (1 − loss).
  • Prices and charging losses are your own entries. They vary with tariff, provider, charging power and temperature and are not claimed to be current here.
  • Purchase, servicing, insurance, tyres, parking fees and depreciation are not included. The result is an energy cost calculation, not a total cost of ownership.
Worked example

15,000 km per year, 18 kWh/100 km, 10 % charging losses, 80 % home charging at €0.35/kWh, 20 % public charging at €0.59/kWh: battery energy 2,700 kWh, grid energy 3,000 kWh, cost €1,194.00 per year. Without solar power.

Frequently asked questions

Why does the calculator separate battery energy and grid energy?

The car takes energy from the battery. While charging, additional energy is lost in the charger, the cable and the battery. You pay for those losses, but they never reach the car. The calculator therefore scales battery consumption up to grid energy.

Which consumption figure should I enter?

The figure from the trip computer or from your own charging log – the energy that actually reaches the car. The WLTP figure is too high for this because it already includes charging losses.

Is charging at home really cheaper?

Usually yes, because the household electricity price is below the price at public charge points. Whether that holds for you depends on your tariff and on the price of your charging tariff. Enter both and the calculator compares them.

Why is the result only an estimate?

Consumption, charging losses and prices depend on driving style, outside temperature, charging power, tariff and provider. The calculator shows the order of magnitude of your energy costs, not your actual bill.

Where the defaults come from

The defaults are dated guide values. They are not updated automatically – check them if needed and overwrite them with your own figures.

  • Consumption 18 kWh/100 km: from measured ADAC test consumption (13.4 to 29.7 kWh/100 km, as of 6/2026) and the ifeu institute WLTP evaluation (17.1 kWh/100 km, 14 Feb 2025). Real consumption is 18 to 25 % above WLTP (ICCT, 07/2025).
  • Charging losses 7 %: ADAC study on charging losses, 11 kW wallbox at 5.1 to 7.0 %, household socket 12.7 to 24.2 %, rapid charging 5 to 15 % (page as of 2026).
  • Household electricity €0.37/kWh: BDEW electricity price analysis, new-customer tariffs at 3,500 kWh, data as of 08/2026.
  • Public charging €0.59/kWh: consumer advice centre, on average around 52 ct (AC) and 60 ct (DC), as of 4 Mar 2026; motorway ad-hoc prices are 64 to 87 ct/kWh (ADAC, 23 Jul 2025).
  • Value of solar power €0.077/kWh: the feed-in tariff forgone for systems up to 10 kW commissioned between 1 Aug 2026 and 31 Dec 2026 is 7.70 ct/kWh (Federal Network Agency, retrieved 27 Sep 2026).

Disclaimer

All information is provided without guarantee. The results of this calculator are a non-binding estimate and serve for guidance only. We accept no liability for incorrect, incomplete or wrongly transmitted input, or for the results calculated from it. Terms of Use